Add resume_throw_ref to the explainer #132
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Give it opcode 0xe5 to be adjacent to `resume_throw` at 0xe4, and as a result bump `switch` to 0xe6. Redefine the execution semantics of `resume_throw` in terms of `resume_throw_ref`. As a drive-by, fix the nullability of reference operands in the initial introduction of each other instruction.
rossberg
approved these changes
Oct 9, 2025
| aborted with `resume_throw`; directly switched to via `switch`; or | ||
| partially applied with `cont.bind`. | ||
| There are five different ways in which suspended continuations are | ||
| consumed (`resume,resume_throw,resume_throw_ref,switch,cont.bind`). |
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Nit, while here:
Suggested change
| consumed (`resume,resume_throw,resume_throw_ref,switch,cont.bind`). | |
| consumed (`resume`, `resume_throw`, `resume_throw_ref`, `switch`, `cont.bind`). |
| - iff `S.conts[ca] = epsilon` | ||
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| * `S; F; v^m (ref.cont ca) (resume_throw $ct $e hdl*) --> S''; F; prompt{hdl'*} E[(ref.exn |S'.exns|) throw_ref] end` | ||
| * `S; F; (ref.null t) (ref.cont ca) (resume_throw_ref $ct hdl*) --> S; F; trap` |
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To make the rules non-overlapping:
Suggested change
| * `S; F; (ref.null t) (ref.cont ca) (resume_throw_ref $ct hdl*) --> S; F; trap` | |
| * `S; F; (ref.null t) (ref.cont ca) (resume_throw_ref $ct hdl*) --> S; F; trap` | |
| - iff `S.conts[ca] = (E : n)` |
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Can you bump the opcode in the implementation in this PR, too? The numbering will break in coordinating between tools that do use |
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Give it opcode 0xe5 to be adjacent to
resume_throwat 0xe4, and as aresult bump
switchto 0xe6.Redefine the execution semantics of
resume_throwin terms ofresume_throw_ref.As a drive-by, fix the nullability of reference operands in the initial
introduction of each other instruction.